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PPC7410 as a replacement for the 7400?

It's a bit of a odd question, but does anyone know if the 7410 is a drop in replacement for the 7400?

After reading that the G3 CPU on the original iMac's CPU card can be swapped with a G4 i have become a little obsessed with the idea...

A quick google shows that the 7400 is pin compatible with the PPC750 but the 7400 is next to impossible to findI know i could just pinch one off a dead machine (i'm looking at you, TiBook with a dead GPU) but i see 3 problems here:1) It seems no one makes 0.89mm solderballs or stencils2) No one makes a 25x25mm 360 pin stencil in the next nearest size solder ball (0.76mm)3) I suck at reballing chips.... (soldering BGA chips is fine, but reballing them.... those solder balls are so damn small....)

In theory i could use the next nearest size stencil (30x30mm) with 0.76mm solder balls (since the pitch is measured from the center of the pads this should work) but it would be a bit of a bodge job (and could screw up the spacing between the CPU and heatsink)

The 7410 however is still relativity easy to get at a sort of sensible price (£20 a chip, or just under £10 each if i where to buy 5, not that i need 5...)

Re: PPC7410 as a replacement for the 7400?

No need, the new chips should come with solder balls already attached. So it's just a matter of lifting the old chip, cleaning the pads on the board and soldering the new one on

I have found stencils that 'should' work, but they are the incorrect size and are a smaller size of solder ball, but it should work in a pinch. But since I have found now chips at a affordable price there is no need for them now